Every CVE Search/ Get API key

CVE-2026-73646

PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure

7.5 HighFix available

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.53%Up 0.2 points since Aug 18, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.

Record
CVE-2026-73646
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-22
Updated
2026-11-02
EUVDEUVD-2026-60239 7.5

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.

Record
EUVD-2026-60239
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
NVD 7.5

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.

Record
CVE-2026-73646
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-22
Updated
2026-11-02
OSV 7.5

PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.

Record
CVE-2026-73646
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-22
Updated
2026-11-02
OSVDEBIAN-CVE-2026-73646 7.5

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.

Record
DEBIAN-CVE-2026-73646
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVRHSA-2026:50287 7.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Record
RHSA-2026:50287
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
Show 29 moreShow less
OSVRHSA-2026:54520 7.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Record
RHSA-2026:54520
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-73646 7.5

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.

Record
UBUNTU-CVE-2026-73646
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVCLSA-2026-1787592261 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.3.6-tuxcare.5.

Record
CLSA-2026-1787592261
Updated
2026-11-02
OSVCLSA-2026-1790019520 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 7.0.32-tuxcare.3.

Record
CLSA-2026-1790019520
Updated
2026-11-02
OSVCLSA-2026-1790023229 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 7.0.17-tuxcare.3.

Record
CLSA-2026-1790023229
Updated
2026-11-02
OSVCLSA-2026-1790023231 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 5.2.18-tuxcare.3.

Record
CLSA-2026-1790023231
Updated
2026-11-02
OSVCLSA-2026-1790089248 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.4.14-tuxcare.5.

Record
CLSA-2026-1790089248
Updated
2026-11-02
OSVCLSA-2026-1790089252 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.4.5-tuxcare.4.

Record
CLSA-2026-1790089252
Updated
2026-11-02
OSVCLSA-2026-1790089264 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.4.31-tuxcare.4.

Record
CLSA-2026-1790089264
Updated
2026-11-02
OSVCLSA-2026-1790089280 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.4.41-tuxcare.5.

Record
CLSA-2026-1790089280
Updated
2026-11-02
OSVCLSA-2026-1790089282 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.2.15-tuxcare.4.

Record
CLSA-2026-1790089282
Updated
2026-11-02
OSVCLSA-2026-1790099843 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.5.6-tuxcare.5.

Record
CLSA-2026-1790099843
Updated
2026-11-02
OSVCLSA-2026-1790102697 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.2.13-tuxcare.3.

Record
CLSA-2026-1790102697
Updated
2026-11-02
OSVCLSA-2026-1790541900 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.5.17-tuxcare.1.

Record
CLSA-2026-1790541900
Updated
2026-11-02
OSVCLSA-2026-1790604941 No score

TuxCare security update for postcss (6 CVEs)

TuxCare rebuilt postcss to address 6 CVEs. Fixed in 6.0.1-tuxcare.1.

Record
CLSA-2026-1790604941
Updated
2026-11-02
OSVCLSA-2026-1791377049 No score

TuxCare security update for postcss (2 CVEs)

TuxCare rebuilt postcss to address 2 CVEs. Fixed in 7.0.14-tuxcare.4.

Record
CLSA-2026-1791377049
Updated
2026-11-02
OSVCLSA-2026-1791377114 No score

TuxCare security update for postcss (2 CVEs)

TuxCare rebuilt postcss to address 2 CVEs. Fixed in 7.0.21-tuxcare.4.

Record
CLSA-2026-1791377114
Updated
2026-11-02
OSVCLSA-2026-1791629015 No score

TuxCare security update for postcss (2 CVEs)

TuxCare rebuilt postcss to address 2 CVEs. Fixed in 8.5.3-tuxcare.2.

Record
CLSA-2026-1791629015
Updated
2026-11-02
OSVCLSA-2026-1791629172 No score

TuxCare security update for postcss (2 CVEs)

TuxCare rebuilt postcss to address 2 CVEs. Fixed in 8.5.2-tuxcare.2.

Record
CLSA-2026-1791629172
Updated
2026-11-02
OSVCLSA-2026-1791633202 No score

TuxCare security update for postcss (4 CVEs)

TuxCare rebuilt postcss to address 4 CVEs. Fixed in 8.4.49-tuxcare.1.

Record
CLSA-2026-1791633202
Updated
2026-11-02
OSVCLSA-2026-1791832298 No score

TuxCare security update for postcss (2 CVEs)

TuxCare rebuilt postcss to address 2 CVEs. Fixed in 8.5.12-tuxcare.2.

Record
CLSA-2026-1791832298
Updated
2026-11-02
OSVCLSA-2026-1792765677 No score

TuxCare security update for postcss (2 CVEs)

TuxCare rebuilt postcss to address 2 CVEs. Fixed in 8.5.14-tuxcare.1.

Record
CLSA-2026-1792765677
Updated
2026-11-02
OSVCLSA-2026-1792765790 No score

TuxCare security update for postcss (3 CVEs)

TuxCare rebuilt postcss to address 3 CVEs. Fixed in 8.4.35-tuxcare.1.

Record
CLSA-2026-1792765790
Updated
2026-11-02
OSVCLSA-2026-1792791822 No score

TuxCare security update for postcss (3 CVEs)

TuxCare rebuilt postcss to address 3 CVEs. Fixed in 8.2.9-tuxcare.2.

Record
CLSA-2026-1792791822
Updated
2026-11-02
OSVCLSA-2026-1793097120 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.4.17-tuxcare.2.

Record
CLSA-2026-1793097120
Updated
2026-11-02
OSVCLSA-2026-1793097204 No score

TuxCare security update for postcss (1 CVE)

TuxCare rebuilt postcss to address 1 CVE. Fixed in 8.4.33-tuxcare.2.

Record
CLSA-2026-1793097204
Updated
2026-11-02
OSVCLSA-2026-1793125669 No score

TuxCare security update for postcss (2 CVEs)

TuxCare rebuilt postcss to address 2 CVEs. Fixed in 8.5.5-tuxcare.3.

Record
CLSA-2026-1793125669
Updated
2026-11-02
OSVopenSUSE-SU-2026:12070-1 No score

velociraptor-0.76.7.0.git145.b60ef1146-1.1 on GA media

These are all security issues fixed in the velociraptor-0.76.7.0.git145.b60ef1146-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12070-1
Updated
2026-11-02
OSVROOT-APP-NPM-CVE-2026-73646 No score

CVE-2026-73646 in postcss - Patched by Root

Root has patched CVE-2026-73646 in the postcss package for Root:npm. Multiple fixed versions available.

Record
ROOT-APP-NPM-CVE-2026-73646
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
postcss
TuxCare:npm
8.3.6-tuxcare.0 up to 8.3.6-tuxcare.5, plus listed versions
8.3.68.3.6-tuxcare.18.3.6-tuxcare.28.3.6-tuxcare.38.3.6-tuxcare.4
8.3.6-tuxcare.5
postcss
TuxCare:npm
7.0.32-tuxcare.0 up to 7.0.32-tuxcare.3, plus listed versions
7.0.327.0.32-tuxcare.17.0.32-tuxcare.2
7.0.32-tuxcare.3
postcss
TuxCare:npm
7.0.17-tuxcare.0 up to 7.0.17-tuxcare.3, plus listed versions
7.0.177.0.17-tuxcare.17.0.17-tuxcare.2
7.0.17-tuxcare.3
postcss
TuxCare:npm
5.2.18-tuxcare.0 up to 5.2.18-tuxcare.3, plus listed versions
5.2.185.2.18-tuxcare.15.2.18-tuxcare.2
5.2.18-tuxcare.3
postcss
TuxCare:npm
8.4.14-tuxcare.0 up to 8.4.14-tuxcare.5, plus listed versions
8.4.148.4.14-tuxcare.18.4.14-tuxcare.28.4.14-tuxcare.38.4.14-tuxcare.4
8.4.14-tuxcare.5
postcss
TuxCare:npm
8.4.5-tuxcare.0 up to 8.4.5-tuxcare.4, plus listed versions
8.4.58.4.5-tuxcare.18.4.5-tuxcare.28.4.5-tuxcare.3
8.4.5-tuxcare.4
postcss
TuxCare:npm
8.4.31-tuxcare.0 up to 8.4.31-tuxcare.4, plus listed versions
8.4.318.4.31-tuxcare.18.4.31-tuxcare.28.4.31-tuxcare.3
8.4.31-tuxcare.4
postcss
TuxCare:npm
8.4.41-tuxcare.0 up to 8.4.41-tuxcare.5, plus listed versions
8.4.418.4.41-tuxcare.18.4.41-tuxcare.28.4.41-tuxcare.38.4.41-tuxcare.4
8.4.41-tuxcare.5
postcss
TuxCare:npm
8.2.15-tuxcare.0 up to 8.2.15-tuxcare.4, plus listed versions
8.2.158.2.15-tuxcare.18.2.15-tuxcare.28.2.15-tuxcare.3
8.2.15-tuxcare.4
postcss
TuxCare:npm
8.5.6-tuxcare.0 up to 8.5.6-tuxcare.5, plus listed versions
8.5.68.5.6-tuxcare.18.5.6-tuxcare.28.5.6-tuxcare.38.5.6-tuxcare.4
8.5.6-tuxcare.5
Show 27 moreShow less
Affected packages
PackageAffectedFixed
postcss
TuxCare:npm
8.2.13-tuxcare.0 up to 8.2.13-tuxcare.3, plus listed versions
8.2.138.2.13-tuxcare.18.2.13-tuxcare.2
8.2.13-tuxcare.3
postcss
TuxCare:npm
8.5.17-tuxcare.0 up to 8.5.17-tuxcare.1, plus listed versions
8.5.17
8.5.17-tuxcare.1
postcss
TuxCare:npm
From an advisory covering 6 CVEs
6.0.1-tuxcare.0 up to 6.0.1-tuxcare.1, plus listed versions
6.0.1
6.0.1-tuxcare.1
postcss
TuxCare:npm
7.0.14-tuxcare.0 up to 7.0.14-tuxcare.4, plus listed versions
7.0.147.0.14-tuxcare.17.0.14-tuxcare.27.0.14-tuxcare.3
7.0.14-tuxcare.4
postcss
TuxCare:npm
7.0.21-tuxcare.0 up to 7.0.21-tuxcare.4, plus listed versions
7.0.217.0.21-tuxcare.17.0.21-tuxcare.27.0.21-tuxcare.3
7.0.21-tuxcare.4
postcss
TuxCare:npm
From an advisory covering 2 CVEs
8.5.3-tuxcare.0 up to 8.5.3-tuxcare.2, plus listed versions
8.5.38.5.3-tuxcare.1
8.5.3-tuxcare.2
postcss
TuxCare:npm
From an advisory covering 2 CVEs
8.5.2-tuxcare.0 up to 8.5.2-tuxcare.2, plus listed versions
8.5.28.5.2-tuxcare.1
8.5.2-tuxcare.2
postcss
TuxCare:npm
From an advisory covering 4 CVEs
8.4.49-tuxcare.0 up to 8.4.49-tuxcare.1, plus listed versions
8.4.49
8.4.49-tuxcare.1
postcss
TuxCare:npm
From an advisory covering 2 CVEs
8.5.12-tuxcare.0 up to 8.5.12-tuxcare.2, plus listed versions
8.5.128.5.12-tuxcare.1
8.5.12-tuxcare.2
postcss
TuxCare:npm
From an advisory covering 2 CVEs
8.5.14-tuxcare.0 up to 8.5.14-tuxcare.1, plus listed versions
8.5.14
8.5.14-tuxcare.1
postcss
TuxCare:npm
From an advisory covering 3 CVEs
8.4.35-tuxcare.0 up to 8.4.35-tuxcare.1, plus listed versions
8.4.35
8.4.35-tuxcare.1
postcss
TuxCare:npm
From an advisory covering 2 CVEs
8.2.9-tuxcare.0 up to 8.2.9-tuxcare.2, plus listed versions
8.2.98.2.9-tuxcare.1
8.2.9-tuxcare.2
postcss
TuxCare:npm
8.4.17-tuxcare.0 up to 8.4.17-tuxcare.2, plus listed versions
8.4.178.4.17-tuxcare.1
8.4.17-tuxcare.2
postcss
TuxCare:npm
8.4.33-tuxcare.0 up to 8.4.33-tuxcare.2, plus listed versions
8.4.338.4.33-tuxcare.1
8.4.33-tuxcare.2
postcss
TuxCare:npm
From an advisory covering 2 CVEs
8.5.5-tuxcare.0 up to 8.5.5-tuxcare.3, plus listed versions
8.5.58.5.5-tuxcare.18.5.5-tuxcare.2
8.5.5-tuxcare.3
node-postcss
Debian:12
All versions, plus listed versions
8.4.20+~cs8.0.23-18.4.20+~cs8.0.23-1+deb12u18.4.31+~cs8.0.26-18.4.39+~cs9.2.29-18.4.49+~cs9.2.32-1
Show 14 moreShow less
8.5.12+~cs9.3.32-18.5.14+~cs9.3.34-18.5.15+~cs9.3.34-18.5.15+~cs9.3.38-18.5.15+~cs9.3.39-18.5.19+~cs10.2.23-18.5.21+~cs10.2.23-18.5.23+~cs10.2.23-18.5.25+~cs10.2.23-18.5.26+~cs10.2.24-18.5.28+~cs10.2.24-18.5.6+~cs9.3.28-18.5.8+~cs9.3.30-18.5.9+~cs9.3.30-1
None known
node-postcss
Debian:13
All versions, plus listed versions
8.4.49+~cs9.2.32-18.5.12+~cs9.3.32-18.5.14+~cs9.3.34-18.5.15+~cs9.3.34-18.5.15+~cs9.3.38-1
Show 10 moreShow less
8.5.15+~cs9.3.39-18.5.19+~cs10.2.23-18.5.21+~cs10.2.23-18.5.23+~cs10.2.23-18.5.25+~cs10.2.23-18.5.26+~cs10.2.24-18.5.28+~cs10.2.24-18.5.6+~cs9.3.28-18.5.8+~cs9.3.30-18.5.9+~cs9.3.30-1
None known
node-postcss
Debian:14
before 8.5.19+~cs10.2.23-1, plus listed versions
8.4.49+~cs9.2.32-18.5.12+~cs9.3.32-18.5.14+~cs9.3.34-18.5.15+~cs9.3.34-18.5.15+~cs9.3.38-1
Show 4 moreShow less
8.5.15+~cs9.3.39-18.5.6+~cs9.3.28-18.5.8+~cs9.3.30-18.5.9+~cs9.3.30-1
8.5.19+~cs10.2.23-1
prometheus3.13
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
before 0:3.13.2-0.2.hum1
0:3.13.2-0.2.hum1
prometheus3.5
Red Hat:hummingbird:1
From an advisory covering 2 CVEs
before 0:3.5.5-0.8.hum1
0:3.5.5-0.8.hum1
postcss
Root:npm
before 8.4.49-aikido.4
8.4.49-aikido.46.0.1-aikido.28.4.38-aikido.28.5.3-aikido.38.4.21-aikido.28.5.15-aikido.27.0.39-aikido.78.5.8-aikido.55.2.18-aikido.57.0.32-aikido.18.4.32-aikido.17.0.36-aikido.18.5.6-aikido.56.0.23-aikido.38.4.31-aikido.4
@rootio/postcss
Root:npm
before 8.4.49-root.io.4
8.4.49-root.io.46.0.1-root.io.28.4.38-root.io.28.5.3-root.io.38.4.21-root.io.28.5.15-root.io.27.0.39-root.io.78.5.8-root.io.55.2.18-root.io.57.0.32-root.io.18.4.32-root.io.17.0.36-root.io.18.5.6-root.io.56.0.23-root.io.38.4.31-root.io.4
node-postcss
Ubuntu:20.04:LTS
All versions, plus listed versions
6.0.23-16.0.23-3
None known
node-postcss
Ubuntu:22.04:LTS
All versions, plus listed versions
8.2.1+~cs5.3.23-88.4.5+~cs7.1.51-28.4.6+~cs7.3.21-1
None known
node-postcss
Ubuntu:24.04:LTS
All versions, plus listed versions
8.4.20+~cs8.0.23-18.4.31+~cs8.0.26-1
None known
node-postcss
Ubuntu:26.04:LTS
All versions, plus listed versions
8.5.6+~cs9.3.28-18.5.8+~cs9.3.30-1
None known
velociraptor
openSUSE:Tumbleweed
From an advisory covering 40 CVEs
before 0.76.7.0.git145.b60ef1146-1.1
0.76.7.0.git145.b60ef1146-1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-73646 is a high vulnerability (CVSS 7.5) in Postcss, published August 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.53%, the 45th percentile. Fixed in postcss 8.3.6-tuxcare.5.

References

Show 73 moreShow less
MoveEnter Open